These are the raw disk images of the Microsoft OS/2 2.0 Pre-Release-2 disks, complete with 'overcan' information on the manufacturer of some of the disks. The SDK #4 disk was damanged on the first read, luckily the scond read read the two damaged sectors fine, but there was further damage to the physical disk. Luckily there was a 3 1/2" disk version to compare against.